Mercury 225 efi overheated ?

[<Fisher35>]

I recently purchased a Mercury 225 efi.I would like to know if there is a way to visualy tell if the engine has been hot before.There was some white looking stuff on the sides of the lower unit right below the bottom cowl that came off with rubbing compound.The engine runs fine and compression is good.

[<SamtheMan>]

hello
Look for any melted wires along the block or melted plug wire boots. Other than that not much way to tell. Sounds like it has some corrosion.